Boiler



June 6, 1933. c. E. LUCKE 1 1,913,335

BOILER Original Filed Jan. 3, 1927 2 Sheets-Sheet 1 128 $11 72 v 2 :15: 16 Z :14 I

INVENTOR V V B QTffS lac/4e ATTORNEY Jun 6, 1933. i E, LUCKE I 1,913,335

I BOILER Original Filed Jan. 3, 1927 "2 Sheets-Sheet 2 all INVENTOR a7/as [lac/4e ATTORNEY Patented June 6, 1933 umrso STATES PATENT OFFICE exams E. LUCIE, or Nnw YQBI, N. Y, ASSIGNOB 'ro 'rnn'nncoox &. wILcox com:-

PANY, O1 BAYONNE, NEW JERSEY, A. CORPORATION NEW JERSEY roman Driglnal application Med January 8, 1927', Serial No. 158,470. Divided and this application filed.

, I Au ust 11, 1930. Serial no. 4'74,e77.

This invention relates to steam boilers of I the forced circulation type in which the flow in the ass 'ciat'ed boiler.

. waterthrough the water tubes. The operashown in connection with a steam boiler of water through the circulating tubes results from the operation of a circulating pump operated independently of the feed pump and this application is a division of my application Serial No. 158,470, filed January 3, 1927.

An object of this invention is to provide an arrangement of the typeset forth .in which variations in the rate of recirculation of unvaporized water are controlled by varying a the rates of steam generation, the variations in such rates of steam generation resulting in variations in operation of the circulating pump which is driven by steam generated This and other objects which will be apparent to those skilled in this particular art are accomplished by means of the invention illustrated in the accompanying drawings in which Fig. 1 is a transverse sectional view through a steam boiler and associated boiler furnace constructed and arranged in accordance with one embodiment. of this invention.

Figure 2 is a transverse fragments. see- I ue 1n Figure 1. Figure 3 is a view similar to Fig: ure 1 of a modified form of the invention.

The embodiment of the present invention illustrated in Figs. 1 and 2 consists of an arrangement in which a circulating pump independent of the feed pump is employed for causing the circulation of the unvaporized tion of the clrculating pump is controlled by the flow of steam generated, the arrangement including a bypass resulting in a part of the steam generated being used to operate the circulating pump but at no time is all the generated steam so used.

As illustrated, the present invention is re.- vided with a feed water pump inclu 'ng water cylinder 1 and steam cylinder 2. The

exhaust from the steam cylinder is passed through the coil3 located in the feed water tank 4 where the steam is condensed. A suction pipe 5 delivers water to the water cylinder of the pump from the tank and a feed water supply line 6 controlled by a float 7 supillustrated, is of the displacement type and thus controls the rate of circulation of water ,chamber 1 with the boiler.

The separate circulating pump, which is includes steamcylinder 9 and water cylinder 10 receiving the unvaporized water through the pipe 11 from the steam and water separating chamber 12. The line 13 connects the Water chamber 10 of the circulating pump with the boiler. r 'As illustrated in Fig. 1 the circulating pump is of the direct, acting displacement type arranged to be operated by steam generated in the associated boiler, a part of said steam being delivered to the cylinder 9 of the pump, the volume of steam delivered being determined by the setting of the manually operated bypass valve 14. Steam from the steam and water separating chamber 12 7'0 der of the circulating pump through the four-way connection 16 to the steam main 30. However, valve 14' is never entirely closed. By setting thevalve 14: the pump speed for a given rate of steam generation is governed, and the rate of steam generation by controlling the speed of operation of the circulating pump.

As illustrated in Fig. 1, the feed water is carried by the feed water delivery pipe 8 to the first .of a series of adjacent headers 125 located adjacent each other along the side of the furnace outlet flue, thence through tubes 126 back and forth across the flue and through successive headers of the series, From ,the last header the flow is through connections 127 to the drum 128. The mixture of steam and water flows from thisdrum through the pipe 23 to the steam and ing water is circulated through the line 13 one part going to a header 129 located along the bottom and one side of the furnace chamber and outside the setting thereof, thence.

through a row of slag screen tubes 136 to the 100 header 131 located onbed of the furnace and outside of the setting, thence upwardly through wall cooling tubes 132 to a header 133 located above the header 131, and thence downwardly through a connection 134 to the steam and water separating chamber 12.

,Part of the water which is delivered to the furnace outlet flue. The various layers of of the water from the coil 140 leading to the steam and the coil 140 are superimposed upon each other and in contact with each other so as to form, in effect, a metallic water cooling 'wall for the outlet flue. From the upper end ofthecoil' 140 part of the water passes through curved side wall cooling tubes 141 to a header 142, thence through a connection 143 of the collecting drum 128. Another part is conducted by a nipple 144 into the first of aseries of headers 145, the headers of. the series being connected by U-tubes' 146 extending across the flue and beyond the coil 140 and adjacent wall tubes 141. From the last ofdshe series of headers 145 the flow is through connections 146 to the collecting drum 128.

The circulating water delivery tube 13 also delivers water through a branch pipe 147 to a header 148 from which the flow isthrough the connection 149, tubes 150, and, connections 151 to a drum 152 whichis con nected by pipe 153 with the collecting drum 128.

As illustrated in Fig. 3, feed water from the feed water delivery line 8 passes into header 300 and thence through U-tubes 301 across thefurnace flue from one" tube connector 302 to another, finallybeing. carried by tubes 303 to a header 304, thence through the pipe 23 to the steam and waterseparating chamber 12. Water being circulated is deliveredby the line 13 through a branch line 305 into a header 306, thence through rows of tubes 307 into header 308 from which steam and water is conveyed by a connection 309 to the line 23 leading to the steam and water separating chamber 12. Water is also, delivered by the line 13 to a branch line 310 and header 311, from which it flows through a row of tubes 312 into upper headers 313 connected by a connection 314 to the pipe 23 water separating chamber. Circulated water is also delivered through a branch line 315 to a series of connected headers 316, and thence through separate rows of tubes 317 to separate headers 318, each of which is connected by the connection 319 to the steam and water line 23.

The operation of the feed pump ineach modification of the present invention is controlled by the usual float mechanism 16 arranged in the steam and water separator 12, having a valve operating lever 17 connected by'chains 18,'and the like, to the feed pump control valve 19 located in the steam line 14 leading to the feed pump. The amount'of generated steam which is delivered to the circulating pump is controlled by the opening in a valve 14 located in a by-passed portion of the steam line 14. In Fig. 3 a second steam cylinder 9 is provided on .the circulating pump and steam is introduced thereto through a valve controlled pipe 14a provided with ahand controlled valve.

It will be apparent that the operation of the circulating pump in the present invention is controlled by the bypass valve in the steam line which determines the proportion of steam generated which is delivered to the circulating pump. Hence the volume of water recirculated is varied in accordance with the variations in the volume'of generated steam which is delivered to the circulating pump. The hot gas outlet is through the roof of the furnace chamber and steam generating economizer tube sections are located in the gas outlet or flue.

It should be noted in connection with the arrangement disclosed in Fig. 3 that each of the branch lines receiving water from the circulating water delivery line 13 is provided.

with a manually operated valve 320 which provides-manual control for determining the proportion ofcirculated water which ispassed throughthe difl'er ent banks or groups of tubes receiving water from'the circulating pump.

What I claim as new, and desire to secure by Letters Patent, is:

' 1. A steam generator, including a grou of group of convection heated series flow tubes, a water pump for each group of tubes, each pump delivering more water to its respective group of tubes than can be converted into steam thereby, a steam and water separator receiving the discharge from both of said tube groups and delivering the separated wa water wall tubes arranged in paralle, a

ter to the pump for the water wall tubes only,

a steam discharge main from said separator having a by-pass including an actuator for the pump serving the water wall tubes only, and means in the by-passed portion of said steam main controlling the amount of steam by-passing to said actuator, whereby the amount of water supplied to the water wall tubes may be controlled;

2. A steam generator, including a group of water wall tubesarranged in parallel, a group of convection heated series flow tubes, each group having a regulating means to determine the circulation therethrough, a water pump for each group of tubes, each pump-operating to deliver more water to its respective group of tubes than can be converted into steam thereby, a steam and waterseparator receiving the discharge from both of said tube groups and delivering the separated water to the pump for the water wall tubes only, a steam discharge main from said separator having a by-pass including an actuator for the pump serving the water wall tubes only, and means in the by-passed portion of said steam main controlling the amount of steam by-passing to the actuator, whereby the amount of water sup lied to the water wall tubes may be control ed.

CHARLES E. LUCKE. 

